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an unnatural, violent, and unvoluntary contraction of the muscular parts of an animal body

Convulsion(noun)

any violent and irregular motion or agitation; a violent shaking; a tumult; a commotion

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Convulsion

A convulsion is a medical condition where body muscles contract and relax rapidly and repeatedly, resulting in an uncontrolled shaking of the body. Because a convulsion is often a symptom of an epileptic seizure, the term convulsion is sometimes used as a synonym for seizure. However, not all epileptic seizures lead to convulsions, and not all convulsions are caused by epileptic seizures. Convulsions are also consistent with an electric shock. For non-epileptic convulsions, see non-epileptic seizures.
The word "fit" is sometimes used to mean a convulsion or epileptic seizure.